Answer:
2,048 cells
Step-by-step explanation:
Number of cells after 1 hour = 4 * 2 = 8
Number of cells after 2 hours = 8 * 2 = 16
Number of cells after 3 hours = 16 * 2 = 32
Number of cells after 4 hours = 32 * 2 = 64
Number of cells after 5 hours = 64 * 2 = 128
Number of cells after 6 hours = 128 * 2 = 256
Number of cells after 7 hours = 256 * 2 = 512
Number of cells after 8 hours = 512 * 2 = 1,024
Number of cells after 9 hours = 1,024 * 2 = 2,048
